Machine for reboring or refinishing cylinders



5 Sheets-Sheet 1 Sept. 4, 1928.

B. J. FARR ET AL MACHINE FOR REBORING OR REFINISHING CYLINDERS FiledSept. 15, 1924 Sept. 4, 1928.

V B. J. FARR ETAL MACHINE FOR REBORING OR REFIN-ISHING CYLINDERS FiledSept. 15, 1924 3 Sheets-Sheet 2 I I lim Ill III- Sept. 4,1928. 11,683,339

B. J. FARR ET AL MACHINE FOR REBORING OR REFINISHI NG CYLINDERS FiledSept. 15, 1924 s Sheets-Sheet 6 Patented Sept. 4, i928.

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BURT J. FAB/R AND MOSES H. NESTBROOK, 0F BATTLE CREEK, MICHIGAN.

MACHINE FOR REBOEING 0R BEFINISHING CYLINDERS. I

Application filed September 15, 1924. Serial No. 737,679.:

The invention relates to machinesfor reboring or refinishing cylinders.

In railroad practice, it becomes necessary from time to time to re-borecompressors, which usually include a steam-cylinder and an air-cylinder,and when the compressor is of the compound type. two steam cylinders andtwo air-compressors secured'to an intermediate frame. Heretofore, it hasbeen 0 necessary, in re-boring or refinishing a cross compoundair-compressor, to dismantle substantially the'entire compressor and toseparate the cylinders from the intermediate frame and then separatelyand successively 5 re-bore them. it usually took from seven to twelvehours to accomplish this.

One object of the invention is to provide a machine for reducing thetime'necessa-ry for the re-boring operation of a. compressor.

In re-boring these compound cylinders v it isimportant that the alignedcylinders should remain truly coaxial to prevent execsive Wear on thepiston-rod packings and to insure the free operation of the pistons androds in the cylinders, andanother object is to provide an improvedire-boring machine by which this 'coaxiality Will be insured. I

smother object is to provide machine for that purpose by Which thereboring operations can be easily and accurately-effected.

Other objects of the invention wvill appear fronrthe description i 1 lheinvention consists in the several novel features hereinafter setforthand more par-. ticularly defined by claims at the'conclusion hereof. I 1

In the drawings: 1 is a side elevation. Fig. 2 is an end elevation..Fig. 3' is a detail of the gearing for driving" one pair of boringbars. Fig. at is a detail section'of-one of the guide bushings for theinner ends of the boring-bars. of said bushings. Fig. 6' is a'plany'parts being shown in section. Figs. 7 andS are longitudinalsections on an enlarged scale through the ends of one of the boring-barsand associated parts. Fig. 9 is a section on line 9-9 of Fla. 8. Fig. 10is a section on line 10-10 of Fig. 7. I

an improved Fig. 5 is a perspective of one The inventionis exemplifiedin connection with a lVestinghouse cross-compound: aircompressorcomprising sure air-cylinder b and alow-pressure steam cylinder 0, whichis coaxial with the high' pressure air-cylinder'd. Cylinders wand 0 areintegrally formed and cylinders b and d are likewise. 'All of thecylinders are secured to an intermediate cast frame 0. 1 Thiscylintier-structure as exhibited, is of Wellknown construction, thecylinder-heads, pis tons and valve-mech anisms having been removed toprovide access to the cylinders for re-boring. It is not necessary,however in the use of the machine to separate the cylinders from oneanother or from the connecting: frame. I

The invention is exemplified in a machine by which all four'of thecylinders of a cross-compound air-compressor of this type may besimultaneously bored or refinished. A table 1.0 supports the compressor,While itis being re-bored or refinished, and the cyl-' adapted to besecured to the cylinders in lieu of the pump flanges and cylinder-headswhich hare been removed from the cylinders, prelin'iinary to re-boringthe latter.

A boring-bar 20 has its outer end jour nalle'd inthe bearing 22 in frame18 and is provided to rotate a' tool-carrier 24s in the cylinder (1. endjournalledin bearing 21 of frame 18 and is n'ovided to operate atool-carrier 24 m1 cylinder at. A. boring-bar 2O has its outerendjournalled in bearing 21 of frame it) and operates a rotarytoolcarr1er 24 in the a high-pressure. steam-cylinder a, coaxial with alow-pres Table 10 is mounted on and fixed A boring-bar 20 has its outerHis Inn

cylinder 7). A boring-bar has its outer end jo'urnalled in bearing 22 offrame 19 to operate a tool-carrier 24 in cylinder d.

The inner end of the boring-bars 20, 20 20, and 20 are journalled inbushings 23 re spectively which are usually formed of brass and are eachsecured to a screw-cap e which is adapted to be screwed onto the outerend of one of said casings. These bushings are split so as to becontractible by and tapered to fit, and are adapted to be inserted inthe usual stufling-box casings e in frame 6 ofin connected relation tothe head-frames.

The frames 18 and 19 comprise ring-portions which are provided withholes 26 which are adapted to register with the boltholes in thecylinder-structure of the compressor for the bolts which attach thecylinder-heads thereto, so that the frames 18 and fill 19 may berigidly, detachably and quickly secured to the cylinders. In order toaccurately support the outer end of the boringbars axially in thecylinders, tapped lugs 27 are formed on the frames 18and 19 for radialthumb-screws 28-, by which the supporting frames may be accuratelyadjusted to centrally position the boring bars in the cylinders. Frames18 and 19 are recessed outwardly so that the tool-carriers at thebeginning of an operation can be disposed outwardly of the cylinders sothe tools will commence to cut at the outer .ends cylinders.

The boring-bars for cylinders a and b are aligned with each other andthe bars for cylinders 0 and d are also aligned The inner end of eachboring-bar is connected to its aligned bar by a coupling 29 which isprovided with ribs 30 and 31 to enter recesses 32 in the barsrespectively. This coupling forms a driving connection between thecoaxial boring-bars so that one will be driven from the other.

Boring-bars 20 and 20 are driven from motor 16 and boring-bars 20 and 20are driven from motor 15, by means of gearreductions which are similarin construction.

Each of said reductions comprises a pinion 33 on the motor-shaft; a gear34, meshing with said pinion 33, and fixed to drive a pinion 35 whichmeshes with a gear 36; a

of the pinion 37 fixed to rotate with gear 36; and a gear 38 driven bypinion 37 and fixed to one of said boring-bars. Each of these gearings,with the exception of pinion 33, is enclosed in a housing which iscomposed of a flanged member 40 and a side plate 41 which are crossconnected by spacer-bolts 42. Each housing supports one of thesegearings and is pivotally held on the hub of gear-wheel 38 and is heldagainst rotation by a fork 44 which is provided with slots 45 to receivestuds 46 on the housing. Fork 44 is fixedly supported by the post 47which is adjustably supported from one of the motor base-plates 14. Thestuds 46 can be swung out of'the slots 45, so that the head frames maybe readily withdrawn from the cylinder structure.

Each toolcarrier comprises a hub 50, which is longitudinally slidable onone of the boring-bars and is caused to rotate therewith by a' block 51which is slidably held in a slot 52 in the boring bar and is held andlocked to said hub by a lug 54 fitting in a recess 55 therein and alsoby a screw 56. Each hub .50 is provided with arms 57 in which a boringor other suitable finishing tool 60 is adjustably held by any suitableor well known means in position to operate on the inner periphery of oneof the cylinders. Each boring-bar is provided with a device forautomatically feeding the tool longitudinally of the cylinder. Thisdevice comprises a spindle 61 which is provided with a screw 62interfitting with a female thread 63 on the key-block 51 attached to oneof the tool carriers; This spindle is driven from its boring-bar by agear-train comprisinga pinion 64 which is fixed to rotate with the barby a screw-thread 65; a double idler pinion 66, 67 mounted on a shaft68; a pinion 69 looselyheld on the spindle 61; and a clutch-collar 70which is connected by a spline and way 71 to the spindle, and hasclutch-teeth interfitting with similar teeth on thepinion 69. Each shaft61 is rotatable in its boring-bar and held against longitudinal movementby a shoulder 24 confined in a recess in said bar and held againstoutward movement by a washer 24 and the inner end of the hub of gear 64.Clutch-collar 70 is slidably movable into and out of engagement withpinion 69, so that whenever it is desired to position a tool-carrier inthe cylinder independently of the automatic feed or retracted, it can bequickly done by disengaging the collar 70 from said pinion 69 androtating the spindle directly by means of a crank 72 fixed to its outerend and independently of the gear train. A gear-housing 73encloses'gears 64, 66, 67, and 69. Shaft 68 is mounted in a plate 74which encircles the boring-bar with which it is associated. This plateis ill positioned against one of the sides of one of the gear-housings4O, 41 by a collar 75, which is screw-threaded to the. outer end of theboring-bar. Lugs 6, secured to the housings respectively are eachprovided with a fork 77 which straddles one of the shafts 68 to hold thelatter and the pinions thereon against bodily rotation with the boringbar and spindle therein. The shafts 68 for the feed mechanism for boringbars 20 and 20 are directly secured in frames 18 and 19 respectively. I

Each ofthese devices causes one tool-carrier to be fed inwardly in thecylinder while the bar is driven and exemplifies an automatic feed tomove the tool longitudinally of the cylinder, which is removable withone of the boring-bars and head-frames, so that the feed-device, bar andframe will remainin connected relation, so they may be conjointlyremoved from and mounted on the cylinder-structure.

The operation of the improved machine will be as follows: When across-compound compressor-cylinder is to be bored, the compressor isremoved from the locomotive and its heads, with the valvestherein andpiston rods, are removed from the compressor, leaving the cylindersconnected to the frame 6, so that the co-relation of the cylinders willnot be disturbed, and the piston-rod packings and their followers areremoved from the frame 6. The boring-bars are passed through thecylinders from the outer ends thereof respectively, and the frames 18and 19 are accurately positioned by screws 28, so the boring bars willbe. truly coaxial with the cylinders. Bushings 23 will be inserted inthe packing-box casings in the frame 6, so that each boring-bar willhave a bearing at its inner end in one of these bushings and in one ofthe head-frames 18, 19 at its outer end. The bolts for attaching thecompressor-heads will then he used to secure the frames '18, 19 to thecylinder-structure. As the boring-bars are in serted into the cylindersfrom opposite ends, the couplings 29 will be placed between thecontiguous ends of the aligned boring bars, so that one will be drivenfrom the other. When the head-frames 18 and 19 are secured in operativeposition, the housings 10, ll, for the gear-reductions will be swung sotheir studs 16 will pass into engagement with the forks as on thestationary support will be disposed outwardly of the ends of thecylinders. l Vhenthe machine has been thus connected to the compressor,the motors may be singly or collectively operated under control ofswitches 15", 16. The boring-bars 20*, 20 will be driven to rotate thetools carried thereby-and bars 20 and 20 will be driven by couplings 29.Simultaneously, the tool-carriers will be, fed progressively inwardly,so that the entire area of the cylinders will be re-bored or .refinished during the instrokes of the tools. This feeding of the tools iseffected by the rotation of the boring-barseach of which drives thescrew-spindle 61 therein through pinions 64, 66, 67, 69 andclutch-collar 70. lVhen the cylinders have been thus re-bored orrefinished, the clutch-collars 70 of the tool-feed devices can bedisengaged from their pinions 69, so that the spindles 61 can be quicklyretracted by cranks 72. Next, the housings a0, 41 are disconnected fromforks 1 1 and the frames 18, 19 areremoved from the cylinders.Thereupon, the frames 18, '19 and mechanismscarried thereby can beremovedfrom the cylinders and the lat ter can be removed forreplacement.

In practice, it has been found that the time necessary. to re-bore thecylinders of a cross-compound air compressor can be per-1 formed inapproximately two hours, while under prior practice, so far as knowntous, this work had required approximately from seven to twelve hours. Theconnections be-- tween the cylinders and the frame care not disturbed,so that their relative positions will not be disturbed and the gasketsbetween them will not be destroyed, which sometimes occurs in practicewhen the cylinders are individually bored in accordance with priorpractice. -The invention also exemplifies a machine in which I the truecoaxiality of the cylinders, which is necessary to prevent undue wear ofthe packing boxes for the piston-rods, isreadily attained,

because the longitudinally aligned cylinders I 5 are bored by coaxialtool-carriers. The.

machine can be operated so as to individually re -bore the c linders ormay beused to i 7 a simultaneously re-bore two aligned cylinders or tosimultaneously re-bore four of the cylinders. Certain features of theinvention are susceptibleof use in connection with a compressor whichcomprises butone steameylinder and ,one'air-cylinder.

.The invention is not to be understood as restricted to the details setforth since these may be modified within the scope of the appendedclaims, without departing from th spirit and scope of the invention.

'Having thus described the invention, what we claim as new and desire tosecure by Letters Patent, is: I i i 1. In mechanism for re-boringcylinders, the-combination of abase for supporting a cylinder to bebored, a frame adapted to be ihll removably connected to and supportedby the cylinder, aboring-bar carried by the frame, a motor mounted onthe base, driving means for the bar carried by the frame and shiftableas a unit into driving relation with the motor and a tool-carriermounted on the bar.

2. In mechanism for re-boring cylinders, the combination of a base forsupporting the cylinders to be bored, a pair of frames adapted to beremovably connected .to and supported by the cylinders, a pair ofboringbars carried by the frames a motor mounted on the base, drivingmeans for the bars car ried by the frame and shiftable as a unitintodriving relation with the motor and toolcarriers on the bars.

3. In mechanism for re-boring cylinders, the combination of a base forsupporting a structure comprising a pair of coaxial cylinders to bebored, a pair of frames adapted to be removably secured to and supportedby the the outer ends of said cylinders, a pair of boring-bars carriedby the frames respec tively in coaxial alignment and driven one from theother, tool-carriers. mounted on the bars, mechanism for driving one ofsaid bars and means carried by each frame for automatically'feeding thetoolcarrier on the bar which is carried thereby.

4:. In mechanismfor re-boring cylinders, the combination of a base forsupporting a structure comprising a pair'of cylinders to be bored, apair of frames adapted to be removably connected .to and supported bysaid cylinders, a pair of boring-bars carried by the frames, mechanismfor driving one of the bars, and tool-carriers mounted on the bars, saidbars being insertable with the carriers thereon into the cylinders fromopposite ends thereof and driven one from the other.

5. In mechanism for re-boring cylinders, the combination of a base forsupporting a structure comprising a pair of coaxial cylinders to bebored, a pair of frames adapted to be removably connected to andsupported by the outer ends of said cylinders, a pair of boring-barscarried by the frames in coaxial alignment, mechanism for driving one-ofthe bars, and tool-carriers mounted on the bars, said bars beinginsertable wit-h the carriers thereon into the cylinders from oppositeends thereof and driven one from the other.

6. In mechanism for re-boring cylinders,

the combination of a base for supporting a' unitary structure comprisinga pair of coaxial and spaced cylinders, a pair of frames adapted to beremovably secured to and supported by the outer ends of said cylinders,a pair of boring-bars carried by the frames in coaxial alignment,tool-carriers mounted on said bars, mechanism for driving one of thebars, and a drive coupling between said bars and disposed inwardly ofthe cylinders, said coupling'being adapted'to permit the bars with thecarriers thereon to be withposition. 7

11. In a re-boring machine of the characdrawn from the opposite ends ofthe cylinders. I

7. In mechanism for re-boring cylinders, the combination of a base forsupporting a unitary structure comprising two pairs of coaxial cylindersto be bored, two pairs of boring-bars, the bars of each pair beingdriven one from the other and insertable endwise into the cylinders, apair of frames,

each for carrying two of said bars, said fill each for carrying two ofsaid bars, said frames being adapted to be removably secured to andsupported by the opposite ends of the cylinders, tool-carriers mountedon the bars, mechanism for driving one bar of each pair of bars, andmeans carried by each frame for automatically feeding the carriers onthe bars which are carried thereby.

9. In mechanism for re-boring cylinders, the combination of a base forsupporting a unitary structure comprisingtwo pairs of coaxial'cylindersto be bored, two pairs of boring-bars, the bars of 'each' pair beingdriven one from the other and insertable endwise into the cylinders,frames adapted to be removably secured to and supported by the outerends of said cylinders and by which the bars are carried, .toolcarrier'smounted on the bars, and means fordriving one bar of each pair of barscomprising motors mounted on the base.

10. In mechanism for re-boring cylinders, the combination of a base forsupporting a cylinder to be bored, a frame adapted to be removablysecured to and supported by the cylinder, a boring-bar carried by theframe, a tool-carrier mounted on the bar, a motor mounted on the base,and gearing for driving the bar from the motor, said gearing beingmounted on the frame and pivoted toswing into engagement with the motorwhen the frame has beensecured in its operative ter described, thecombination of a pair of supporting head-frames provided with meanswhereby they may be secured to the outer:

ends'of a pair of cylinders respectively, re-

bor'ing bars mounted in said frames insert-t able into the outer ends ofthe cylinders respectively, mechanism for driving one of theboring-barscomprising a motor and gearing, and a detachable connectionin the gearllu ing for permitting the frame to be removed independentlyof the motor.

12. In a r'e-boring machine of the character described, the combinationof a pair of supporting head-frames provided with means whereby they maybe secured to the outer ends of a four-cylinder structure, a pair ofre-horing bars mounted in each of said frames, insertable into the outerends of the cylinders respectively, mechanism for '3 driving one of theboring-bars comprising a motor and gearing, and a detachable connectionin the gearing for permitting the frame to be removed independently ofthe motor. Signed at Battle Creek, Michigan, this 28 day of August,1924.

BURT J. FARR.

MOSES H. WESTBROOK.

